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I have uploaded everything to http://www.chooseyourecig.com/javagame/helloworld.html . When I visit this page from my computer (Windows Vista) using both Firefox and Internet Explorer, it works just fine. But when my brother visits on his computer (Windows 7) using the same browsers, it does not work. Also, when my daughter visits from her computer (Windows XP) using both Google Chrome and Internet Explorer, it does not work for her either. What is the most likely cause of this? Thanks in advance for any help you can provide.